12928491 has 20 divisors (see below), whose sum is σ = 19436472. Its totient is φ = 8563968.

The previous prime is 12928481. The next prime is 12928501. The reversal of 12928491 is 19482921.

It is an interprime number because it is at equal distance from previous prime (12928481) and next prime (12928501).

It is not a de Polignac number, because 12928491 - 2⁵ = 12928459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12928481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15220 + ... + 16046.

Almost surely, 2^12928491 is an apocalyptic number.

12928491 is a deficient number, since it is larger than the sum of its proper divisors (6507981).

12928491 is an equidigital number, since it uses as much as digits as its factorization.

12928491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1023 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 12928491 is about 3595.6210868221. The cubic root of 12928491 is about 234.7015435511.

The spelling of 12928491 in words is "twelve million, nine hundred twenty-eight thousand, four hundred ninety-one".